Blade-holding mechanism for blade-sharpening machines.



W. E. NICKERSON.

BLADE HOLDING MECHANISM FOR BLADE SHARPENING MACHINES.

q APPLlCATldN FILED FEB. 2. 1916. v A Z QMQ QMB Patented (m1, 1918.

2 SHEET5 HEEI I.

w. E. NICKERSON.

BLADE HOLDING MECHANISM FOR BLADE SHARPENING MACHINES.

APPLICATION FILED FEB. 2 1916- L 1 no ifiafl g n Patemed Oct, 1, 19m.

2 SHEETS-SHEET 2.

m 11% and.

To (255 105mm 1 Be $01?? a, citiiw Cambrid I 8% and 97mm or ceF-mil; flaw int Kbaited. "/0 1' 'lolfier cm'a'zprisum :2. tn. S de iatm'ailly 011 i; as hnriz the bracket an nprigl i; p to the top @f the carriaw i, Amping devices summed to p 0 0f @w M11 5 ands arranged that blade l Mmmby W151i bs locatad. in a herimntal midway between the axes of 1 ts filccated. one above the is invezi piayea. in 2,. .J a, stmpping; dav'ice $5 balding the, Ma, Ede-awning dwviwq as mns bmcziihe sharpening da A with (iiflatie blade (shewn 8 inbenfli 5Q pro'y'ide w I) consist of app e? 3.01%? jm' E- \U having fiat nner adapted 1%. 1e Made and 10161 it 111;; gamble flux .30 upping opemfisn, with the edg a Dped 'pmjesct'ing bay 01m the fwvs. The

I 12m 1 1S farmed lni'egrsL-l wni ltl Q F AS-m 2 Ty 222m: clufms as as piinmpm 21. Whmh 1s; magi- 24i in? an H ingz 330%: with wasps M clamping $129 01m U. beit ei to the top the mm raspeci; i as pmmded "W151! upwardly ,5

ich are spasm? R0 n m blads and. pusia 3mm, tr 1 he jams are closed. "position at aha blade Whfle being ed is acsumtely detennined by ads'bop Such a, horizmitafiyaxt 'adm'fi 3301i 14 cm'liari by Hm 1 maket an; x .131 wnih a 1001 nut 1.5 this 330111 ii in pesition m be engagefiqhy a cmm t0 the under side can strapping davices T which ha-vs the fwrm ssU .-,,m zn of e2 cylivamimr and act 011 e in alternation are suppox-zefi five $313538 6 in @33 13 welative pnsi- 1 F155. 1, but as m: 11m rt 1H in 1mm imam or their (up-maxim n1 ammshim; strappin J 1. "ViG'W Jf z, mwanism for described thus; far the "e noisier and away s'vanfiafi the same a 116 strapping devices; and w in m 003361163111 6 is a detail ViGW "partly in swifon to, Whifil aim 1g; an air check h yeina' wr described. In means carrim? E mechanism mush-Med 111 Mg. of "11m s includes a base plate 2 having an .2 strap 11 means of springs 17, which operate to lift.

the upper jaw 9 to the vertical position shown in full hues in Fig. 2 whenever such movement is permitted. For llltWlllI said jaw 9 into its closed position I employ aplunger 18 arranged to slide vertically in the, pedestal 5 and shaped at its upper end to pass through a slot t.) in the plate ii. The jaw 9 is provided with an operating arm it? which overhangs the top of the plunger l8 when the jaw is in open position. and hence when the plunger moves upward it pushes the arm 20 ahead ot' it. and closes said jaw Provision is made for locking the jaw 0 in closed position by giving the rear t'acc of the arm 20 a slant such that when said jaw is closed an i.1p\vardl v-tapering space is provided between said arm 20 and the op- A posed vertical face of an abutment '21 secured to the top of the plate ll, and by providing 'the upper end of the plunger 18 with slanting and vertical taces and 32% which form a wedge adapted to enter said tapering space. The result of this constructionis that when the plunger is moved upward its upper end passes through the slot 19 and ultimately exerts a wedging action on the arm 20. whereby the jaw t) is firmly closed upon the blade and ilnmovably locked in such position, as shown in dotted lines in Fig. 2.. The plunger 18 is preterably operated pneumatically, in which case, the pedestal 5 is bored to form a cylinder and the lower end of the plunger is provided with a piston 24 having a sliding tit. therein, the alinement of the upper end ot the plunger during its upward and downward movements being maintained by a pin carried by the pedestal 5 and having its inner end located in a: vertical groove 26 formed in the plunger. Below the piston 24 provided a chamber 27 in communication with an inlet pipe 28 having at its outer end a nipple 29 for attachment to a flexible pipe connection (not shown) through which compressed air is let into the chamber 97 when ever it desired to close the blade-clamping jaws, and is replaced by suction when said jaws are to be opened.

For moving the blade holder toward and away from the, stropping devices 1 provide a pneumatic cylinder 39 supported in tixcd position on the base plate 2 and preferably extending longitudinally at one, side ot the machine, which cylinder contains a piston 31 adapted to be forced forward by the admission of conn'u'essed air to the rear end of the cylinder through a nipple 32. To the piston 31, is attached a rod 33 which extends forward through the trout end of the cylinder and is preferably surrounded beyond the latter by a casing which terms in eti'ect a reduced extension of the cylinder. This casing is utilized. to receivea portion ot a coiled spring which surrounds the piston rod between the front end of the casing: 34 and the piston 31 and is con?- pressed by the forward movement oi said piston. so that it forces the latter ln'ielt'ward when the air pressure behind it is relieved. The movements thus imparted to tilt piston it: rod $323 are, transmitted to the. carriage by means of racks ill) and 31' connected to the rod ll) and the block lb respectively and, meshing with pinions as and 3-? "igidly cured together and mounted on a vert cal stud it) carried by a supporting bracket t-t, Figs. 1 and l. (Quide rollers ti and 4-3 keep the racks 3G and 37 in mesh with their respeetive pinions. as shown in Fig.5. 5. and th" movements ot' the carriage -l arev limited l the adjustable sto bolt l t allauty des *ribed and by a similar stop bolt ll. l l ll'i l.

ln order to prevent llOth when the move. ment of the blade holder toward the stropping devices is arrested by the stop bolt. i the arrahfg enient shown in detail in Fig. 6 may be employed. in this figure. is? indicates a nipple entering; the 0therwise-closed easing :t near its t'ront end and carrying a ball valve to so arranged that air is treaty admitted through the nipple when the pis )1: 3L is forced liaclnvard by the spring as, but ism-(impressed in front of the p ston when the latter is forced forward by the admission of compressed air behind it. 'lhe air thus compressed in tront of the piston passes slowly out of the casing; Ill through a small. perforation f" so that, itv checks the forward movement of the piston without preventing it from ultimately moving the blade holder into contact with the stop bolt l-t.

in using the apparatus, after a blade has been placed in position between the open jaws and the. latter have been closed upon: the blade and loclted by the adn'vission i (aunpressed air to the chainberil. the cor pressed air is admitted to the cylinder 30 and the blade holder is thereby moved town rd the stropping devices until arrested by the bolt i which brings the blado-clamping jaws and blade into the position "shown in dotted lines in Fig. l. The parts remain in tt position until the. stroppinp" of the projfl ing blade edge has been completed. the a pressure beneath the plunger 18 being i'na' ll. tl h 9, @psmf;

e ms L m" 1 Jade ha? L 4 h 8 1 a 6 1? scribed, the combination of blmle-sliarpenn ing devices, a blade holder movable toward and away from the same and provided with elznnping jaws, a pneuinatioully-oper- :ited plunger carried by the blade holder and. adapted to close said jaws and lock them in closed position, an adjustable stop for limiting the movement of said blade holder toward the sharpening devices, and means for operating the blade holder comprising.

:1 cylinder having a piston therein, means for admitting compressed air behind the piston and thereby moving it in one direction, and a spring arranged to move said piston in the opposite direction.

Signed at Boston, Massachusetts, this 29th day of January, 1916;

WILLIAM E. NICKERSON. 

